How to choose a design editor SDK: a decision framework

Disclosure and scope. We build Polotno SDK, one of the options this page discusses. So this page does not rank anything and does not tell you which product is best — we are not a neutral party and cannot honestly pretend otherwise. What we can offer is the decision structure: the questions that actually eliminate options, and where Polotno gets eliminated by them. For any vendor's current pricing and capabilities, we link to their own pages rather than restating figures that go stale.

Most "best design editor SDK" lists are written by vendors, ourselves included. They are worth reading, but a ranking from an interested party is not what makes this decision. The requirements do.

In practice six questions eliminate almost everything. Work through them in order and you usually finish with two candidates, sometimes one.

Question 0: should you buy at all?

Before comparing products, decide whether you are buying an editor or building one.

Build on a canvas library — Fabric.js, Konva — when the editor is the product, when your interaction model is genuinely unusual, or when you have front-end capacity measured in months. These libraries give you a scene graph, transforms, hit detection, and serialisation.

They do not give you text layout, font loading and fallback, undo/redo, a layers UI, templates, image cropping, export pipelines, print-quality PDF, or a side panel. That list is where the time goes, and almost none of it differentiates your product.

A useful test: write down the five editor behaviours your users would complain about if they were missing. If four are table stakes that every editor already has, buy.

Full disclosure on one of those links: Polotno renders through Konva, and both were created by the same person, Anton Lavrenov. So "use Konva directly" versus "buy Polotno" is not a rendering-engine choice — the rendering is identical. It is purely a decision about whether you build the editor layer yourself.

Question 1: do you need a native SDK, or will a WebView do?

"Do you need mobile?" is the question most comparison articles ask, and it is the wrong one — almost every option can reach a phone somehow. The question that actually separates products is how.

Native SDKs per platform. The editor ships as a Swift/Kotlin library, rendering with native UI. IMG.LY's CE.SDK is the main option here, covering web, iOS, Android, and desktop from one vendor. Choose this if you need native performance on older hardware, deep OS integration, or genuine offline operation by default.

Web editor inside a WebView. The editor is a web app your native shell hosts, with a message bridge for passing designs back and forth. This is how Polotno reaches mobile: we document the iOS Swift integration using WKWebView and a WKScriptMessageHandler bridge, with a complete demo project. The same approach works anywhere a WebView exists — Android, React Native, Capacitor — and the editor adapts to touch. Customers ship this in production today.

The WebView route is a real trade-off, not a free lunch:

• You build and maintain the bridge between native and web.
• Memory matters. High-resolution export on an older device needs testing, and often server-side rendering instead.
• Stock photos, templates, and fonts call external APIs, so the device needs a network — unless you take the enterprise option that bundles assets for full offline use.

How to decide: if a WebView is acceptable in your product, this question eliminates nothing and you should move on to Question 2. If you need a genuinely native editor, it eliminates most of the market including Polotno.

Question 2: where must the design data live?

Three models, and the answer is usually dictated by your compliance posture rather than your preference.

• Runs on your infrastructure. The editor is a library in your app; designs never leave your systems. Required for regulated data, and often the deciding factor in enterprise reviews.
• Vendor-hosted. The vendor operates the editor and stores designs. Less to run, more to review.
• Inside another product's ecosystem. Canva's Apps SDK and Connect API put the editing inside Canva. Your users get Canva's template library and stock content, which is a real advantage — but the experience carries Canva's branding and depends on your users having Canva accounts. It is not white-label.

Polotno sits in the first group and also offers an optional hosted rendering service, so it can straddle the first two. If you want a vendor to operate the whole editor for you, look at the fully managed options instead.

Question 3: interactive editing, automated generation, or both?

These are different products that look similar in a feature table.

• Interactive only — users design things by hand. Any editor SDK does this.
• Automated only — you generate thousands of images from templates via API and no human touches a canvas. A render API is a better and cheaper fit than an editor SDK. Bannerbear, Placid, Robolly, and Switchboard Canvas live here.
• Both — users design the template, then your system generates variants from it. This is the case that genuinely needs an editor SDK with an open, documented design schema, because your code has to read and rewrite designs a human made.

If you are in the third group, the question to ask every vendor is: is the design format documented, and can I construct a valid design from scratch in code? Some products expose a schema you can generate. Others only support substituting values into templates their editor produced. Both are legitimate; they are not interchangeable.

Question 4: how much template governance do you need?

If a hundred franchisees edit brand assets, you need locked layers, restricted fonts, approval flows, and brand enforcement. That is a distinct product category, and vendors built around it — Design Huddle, Customer's Canvas — will beat a general-purpose editor SDK on it.

If your users are designing their own things and there is no brand to protect, this whole dimension disappears and you should ignore it.

Question 5: what has to come out the other end?

Export is where projects discover a problem late. Check the specific format before you commit, not the category.

• Screen images (PNG, JPEG, WebP) — universal.
• Print — PDF is not one format. Ask about vector versus raster output, bleed, crop marks, PDF/X-1a, CMYK, and spot colour. A tool that exports "PDF" may still be unusable by your printer.
• Video (MP4, GIF) — supported by some, absent in others.
• Editable handoff (PPTX, SVG, HTML) — needed when the output continues its life in another tool.

For reference, Polotno exports PNG, JPEG, PDF (vector and raster), SVG, HTML, PPTX, GIF, and MP4; the details are in import and export.

Question 6: can you run a procurement cycle?

A practical constraint that is often decisive and rarely discussed.

Some vendors in this category publish prices; others quote against scope. Quote-based pricing tends to signal an enterprise motion — deeper support, longer sales cycle, and a real negotiation. Published pricing lets you start this week without a call.

Neither is better. But if you have six weeks and no procurement budget, that eliminates half the market regardless of features.

Verify the facts yourself

Prices and capabilities in this category change several times a year. Rather than restate numbers that will quietly become wrong, here is where each vendor documents its own:

Worked example

"We are a B2B print shop. Customers personalise products in the browser. We generate the print file automatically after checkout. EU customer data."

• Q0: editor is a feature, not the product → buy.
• Q1: browser-based purchase flow, no native app → nothing eliminated.
• Q2: EU data residency → vendor-hosted needs a DPA review; runs-on-your-infrastructure is simpler.
• Q3: both — customers edit, the system renders → needs a documented, generable schema.
• Q4: moderate — templates are locked, customers change text and images.
• Q5: PDF with bleed, crop marks, and CMYK. This is the real constraint. Many otherwise-suitable tools fail here.
• Q6: no enterprise procurement → published pricing.

Q5 and Q2 do the work. Q1, which most comparison articles lead with, decides nothing.

Head-to-head detail

If you have narrowed to a shortlist, we maintain direct comparisons. They are written by us, with the same conflict of interest declared above:

• Polotno SDK vs IMG.LY
• Polotno SDK vs Design Huddle
• Polotno SDK vs Templated
• Polotno SDK vs Customer's Canvas
• Polotno SDK vs Fabric.js
• Polotno SDK vs Konva.js
• Polotno SDK vs Printess
• Polotno SDK vs Pintura
• Polotno SDK vs Bannerbear
• Polotno SDK vs Placid

For the build-versus-buy maths in more depth, see build vs buy. If you are comparing against Canva as a product rather than as a platform, Canva alternatives covers that.